Apparatus for reclaiming paper pulp and the like from the waste waters in paper-making machines



. E. PARTINGTON. APPARATUS FOR'RECLAIMING PAPER PULP AND THE LIKE FROMTHE WASTE WATERS IN PAPER MAKING MACHINES.

APPLICATION FILED NOV-30. 1921. Patentd 14, 1922.

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UNITED STATES PATENT gOFFlCE.

EDWARD PARTINGTON, 01* ,GLOSSOZP, ENGLAND.

APPARATUS roR REoLA'IMiNG Parr-n rULr' AND THE LIKE rnom" THE WASTEWATERS 1N PAPER- MAKiNG MACHINES; 1

Specification of Letters Patent.

Application filed November 30, 1921. Serial No. 518,805.

To (1Z5 whom it may concern Be it known that I. Enwnnn PARTINGTON,

' subject of the King of Great Britain and Ireland, and a resident ofGlossop, in the county of Derby, England, have invented a certain newand useful Apparatus for Beclaiming Paper Pulp and the like from theWaste \Vaters in Paper-Waking Machines, (for which I have filed anapplication in Great Britain, Yo. H030, filed May 21,- 1920,) of whichthe following is a specification.

This invention relates to the reclaiming of paper pulp and the like fromthe saveall or back water in paper-making machines.

In paper-making machines, the water which passes through the wire andcollects in the save-all troughs therebelow flows to a tank orreceptacle whence it is pumped to a chest or the like alongside the topstock chest or chests. From the chest or the like, which is providedwith rotary paddles, similar to those of the stock chest or chests, tokeep the pulp or fibres etc. in the water in a state of suspension, partof the water is drawn off for mixing with pulp which flows from thestock chests to the sand boxes, while the excess passes off through anoverflow for treatment for the recovery of the fibres, pulp, etc.

The objectof this invention is to provide an improved apparatus forreclaiming from the save-all or back water, the fibres or pulp suspendedtherein, whereby the excess water which overflows from the chest or thelike aforesaid shall be clear and free from fibres or pulp, and watercontaining any desired quantity of fibres or pulp may be drawn off fromthe chest or the like for mixing with the pulp from the stock chest orchests.

According to the invention, the save-all or back water containing pulpor fibres in suspension is introduced gently into a chestor otherreceptacle at or near the bottom thereof and the mixture in the lowerpartof the chest or receptacle is kept in con-' stant gentle movement sothat while the suspended pulp or fibres is or are allowed to settle orgravitate towards the bottom of the chest or receptacle, leaving theliquid in the upper part thereof clear, it is or they are prevented fromdepositing on the bottom of the chest or receptacle and are maintainedin suspension in the lower part of the chest or receptacle, which latteris provided with draw-ofi' outlets arranged at different levels; In theaccompanying drawing, Fig. 1 is a vertical section and Fig; 2 a plan ofone arrangement of apparatus applicable for carrying the invention intoeflect.

Referring to the drawing, 2 is a chest within and close to the concavedbottom of which is or are arranged one or more rotary V paddles 3conveniently carried by central vertical shaft 4, supported from abovein a bearing 5, carried by cross-members 6,-and adapted to be slowlyrotatedby bevel gear ing 7, a shaft 8 also mounted in bearings carriedby the cross-members, and fast and loose pulleys 9.

The chest is provided at the bottom with an inlet 10 and at the top withan overflow outlet 11. Between the inlet 10 and overflow 11, one or morevalve-controlled drawofi' outlets 12 is or are arranged at anappropriate level or levels, and a valve controlled outlet 13 isarranged in the centre of the bottom of the chest.

In operation, the save-all or back water may be pumped into a box ortrough arranged above the chest 2, and -'may gravitate through avalve-controlled pipe from the box or trough tothe inlet 10 so as toenter the chest 2 gently. The water entering the chest 2 by the inlet 10is spread or distributed across the area of the chest by the slowlyrotating paddle or paddles 3 which keep the water in the lower part ofthe chest in constant gentle movement. The paddle or paddles 3 is or areso rotated that-the constant gentle movement imparted by it or them tothe water in the lower part of the chest is not sufficient to so disturbthe water in the upper part of the chest as to prevent the fibres, etc,therein from settling towards the bottom of the chest, but is sufficientto prevent the fibres, etc in the water in the'lower part ofthe chestfrom depositing on the bottom of the latter, and to main-' tain thefibres, etc., in suspension in the Patented Mani 1, 192 2. i

lower part of the chest, by which means the" suspended fibres, etc., actto some extentas a filtering medium for the'fibres', etc., in theincoming water.

Water containing fibres, etc., in suspension can be drawn off by theoutlet 12 formixing with the pulp, and where a plurality of out insuspension can be drawn ofl". Any excess of water passes away by theoverflow 11 at the top as clear water. When the fibres, etc,

in suspension in the lower part of the chest become too dense, the wateror a portion of the water in the lower part'of the chest may be run offthrough the outlet 13 for further treatment for theseparation andrecovery of the fibres, etc., or to the'beating engines or a valve forregulatingthefiow of waste water through said supply pipe whereby toinsure a slow entry of the waste water into the tank, a plurality ofdraw off openings diametrically opposite the supply pipe and positionedat different levels above the bottom, valves controlling said draw offopenings, an overflow opening directly above the draw oif openings andadjacent the top of the tank, a shaft extending axially from the top ofthe tank downward'and terminating near the bottom, an arm extending fromsaid shaft and having a curvature corresponding to' the curvature ofsaid bottom, said arm being positioned slightly above and free from thebottom throughout whereby to avoid scraping action on said bottom, saidarm being also of slight thickness vertically to avoidvundue agitationof the tank contents, and means to rotate said shaft.

In witness whereof I have hereunto set my hand.

EDWARD PARTINGTON.

